1. Preheat the oven to 200C, 180C fan / Gas mark 6.
2. Add in tablespoon of veg oil to large pan and sauté onions, and chillies.
3. Add flour, curry powder cooks for 2 mins then add in whole grain mustard, gradually add milk & cream cook till thicken. (Sauce should be thick)
4. Stir in the Spinach and season.
5. Remove from heat – pour into deep oven dish and leave to cool.
6. Meanwhile boil potatoes for 10-12 minutes and drain and add milk salt & pepper and mash until smooth with no lumps.
7. Add in cut fish to the dish and intersperse around with the prawn’s squeeze lemon over and top with mash – scuff it up with a fork to create a larger surface area for crispness.
8. Cook for 25-30minutes until potatoes are golden brown.
9. To give it a little bit more crispness adds a sprinkle of parmesan cheese.